46 lines
1.9 KiB
Text
46 lines
1.9 KiB
Text
# verbs.ludic - the only way a count changes, and each change is said once
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function iv_change(inventory_st: mut InventoryState, it: int, after: int) -> void {
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let before = inventory_st.iv_counts[it]
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if before == after { return }
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inventory_st.iv_counts[it] = after
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var c: ItemChanged = null
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if len(inventory_st.iv_pool) > 0 {
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c = inventory_st.iv_pool[inventory_st.iv_at]
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inventory_st.iv_at = (inventory_st.iv_at + 1) % len(inventory_st.iv_pool)
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} else { c = new ItemChanged }
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c.item = it
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c.before = before
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c.after = after
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q_push(inv_changes(inventory_st), c)
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}
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# as many of n as there is room for; returns how many went in
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export function inv_add(inventory_st: mut InventoryState, it: int, n: int) -> int {
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if not iv_valid(inventory_st, it) or n <= 0 { return 0 }
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let k = Math.min(n, inv_room(inventory_st, it))
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if k > 0 { iv_change(inventory_st, it, inventory_st.iv_counts[it] + k) }
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return k
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}
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# all n or none
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export function inv_take(inventory_st: mut InventoryState, it: int, n: int) -> bool {
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if not iv_valid(inventory_st, it) or inventory_st.iv_counts[it] < n { return false }
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if n > 0 { iv_change(inventory_st, it, inventory_st.iv_counts[it] - n) }
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return true
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}
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# a count outright, room or not (a starting kit, a correction, the network's word); never below 0
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export function inv_set(inventory_st: mut InventoryState, it: int, n: int) -> void {
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if not iv_valid(inventory_st, it) { return }
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iv_change(inventory_st, it, Math.max(n, 0))
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}
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# everything gone, silently: a new trip, or before a load
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export function inv_clear(inventory_st: mut InventoryState) -> void {
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if inventory_st.iv_counts == null {
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@alloc_ok("once: the counts are made the first time the pack is cleared")
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inventory_st.iv_counts = new []int
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}
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List.clear(inventory_st.iv_counts)
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for i in 0 .. inv_kinds(inventory_st) { kept_push(inventory_st.iv_counts, 0) }
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}
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